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# Copyright 2017-present Open Networking Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from xossynchronizer.steps.syncstep import SyncStep, DeferredException
from xossynchronizer.modelaccessor import model_accessor, FabricCrossconnectServiceInstance, ServiceInstance, BNGPortMapping
from xosconfig import Config
from multistructlog import create_logger
import urllib
import requests
from requests.auth import HTTPBasicAuth
class SyncFabricCrossconnectServiceInstance(SyncStep):
provides = [FabricCrossconnectServiceInstance]
log = create_logger(Config().get('logging'))
observes = FabricCrossconnectServiceInstance
@staticmethod
def format_url(url):
if 'http' in url:
return url
else:
return 'http://%s' % url
@staticmethod
def get_fabric_onos_info(si):
# get the fabric-crossconnect service
fabric_crossconnect = si.owner
# get the onos_fabric service
fabric_onos = [s.leaf_model for s in fabric_crossconnect.provider_services if "onos" in s.name.lower()]
if len(fabric_onos) == 0:
raise Exception('Cannot find ONOS service in provider_services of Fabric-Crossconnect')
fabric_onos = fabric_onos[0]
return {
'url': SyncFabricCrossconnectServiceInstance.format_url("%s:%s" % (fabric_onos.rest_hostname, fabric_onos.rest_port)),
'user': fabric_onos.rest_username,
'pass': fabric_onos.rest_password
}
def make_handle(self, s_tag, switch_datapath_id):
# Generate a backend_handle that uniquely identifies the cross connect. ONOS doesn't provide us a handle, so
# we make up our own. This helps us to detect other FabricCrossconnectServiceInstance using the same
# entry, as well as to be able to extract the necessary information to delete the entry later.
return "%d/%s" % (s_tag, switch_datapath_id)
def extract_handle(self, backend_handle):
(s_tag, switch_datapath_id) = backend_handle.split("/",1)
s_tag = int(s_tag)
return (s_tag, switch_datapath_id)
def range_matches(self, value, pattern):
value=int(value)
for this_range in pattern.split(","):
this_range = this_range.strip()
if "-" in this_range:
(first, last) = this_range.split("-")
first = int(first.strip())
last = int(last.strip())
if (value>=first) and (value<=last):
return True
elif this_range.lower()=="any":
return True
else:
if (value==int(this_range)):
return True
return False
def find_bng(self, s_tag):
# See if there's a mapping for our s-tag directly
bng_mappings = BNGPortMapping.objects.filter(s_tag=str(s_tag))
if bng_mappings:
return bng_mappings[0]
# TODO(smbaker): Examine miss performance, and if necessary set a flag in the save method to allow filtering
# of mappings based on whether they are ranges or any.
# See if there are any ranges or "any" that match
for bng_mapping in BNGPortMapping.objects.all():
if self.range_matches(s_tag, bng_mapping.s_tag):
return bng_mapping
return None
def sync_record(self, o):
self.log.info("Sync'ing Fabric Crossconnect Service Instance", service_instance=o)
if (o.policed is None) or (o.policed < o.updated):
raise DeferredException("Waiting for model_policy to run on fcsi %s" % o.id)
onos = self.get_fabric_onos_info(o)
si = ServiceInstance.objects.get(id=o.id)
if (o.s_tag is None):
raise Exception("Cannot sync FabricCrossconnectServiceInstance if s_tag is None on fcsi %s" % o.id)
if (o.source_port is None):
raise Exception("Cannot sync FabricCrossconnectServiceInstance if source_port is None on fcsi %s" % o.id)
if (not o.switch_datapath_id):
raise Exception("Cannot sync FabricCrossconnectServiceInstance if switch_datapath_id is unset on fcsi %s" % o.id)
bng_mapping = self.find_bng(s_tag = o.s_tag)
if not bng_mapping:
raise Exception("Unable to determine BNG port for s_tag %s" % o.s_tag)
east_port = bng_mapping.switch_port
data = { "deviceId": o.switch_datapath_id,
"vlanId": o.s_tag,
"ports": [ int(o.source_port), int(east_port) ] }
url = onos['url'] + '/onos/segmentrouting/xconnect'
self.log.info("Sending request to ONOS", url=url, body=data)
r = requests.post(url, json=data, auth=HTTPBasicAuth(onos['user'], onos['pass']))
if r.status_code != 200:
raise Exception("Failed to create fabric crossconnect in ONOS: %s" % r.text)
# TODO(smbaker): If the o.backend_handle changed, then someone must have changed the
# FabricCrossconnectServiceInstance. If so, then we potentially need to clean up the old
# entry in ONOS. Furthermore, we might want to also save the two port numbers that we used,
# to detect someone changing those.
o.backend_handle = self.make_handle(o.s_tag, o.switch_datapath_id)
o.save_changed_fields()
self.log.info("ONOS response", res=r.text)
def delete_record(self, o):
self.log.info("Deleting Fabric Crossconnect Service Instance", service_instance=o)
if o.backend_handle:
onos = self.get_fabric_onos_info(o)
# backend_handle has everything we need in it to delete this entry.
(s_tag, switch_datapath_id) = self.extract_handle(o.backend_handle)
data = { "deviceId": switch_datapath_id,
"vlanId": s_tag }
url = onos['url'] + '/onos/segmentrouting/xconnect'
r = requests.delete(url, json=data, auth=HTTPBasicAuth(onos['user'], onos['pass']))
if r.status_code != 204:
raise Exception("Failed to remove fabric crossconnect in ONOS: %s" % r.text)
self.log.info("ONOS response", res=r.text)